All-day radiative cooling using a grating-patterned PDMS film emitter

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For passive radiative cooling applications, all-day harvested cold energy is an essential performance indicator concerning its long-term and continuous operation. To this end, high mid-infrared emissivity of emitter surface is a key parameter for steadily boosting the net cooling power regardless of the time-varying environment. In this work, hexagonal-array grating-patterned PDMS film on a silver reflector is proposed for efficient 'all-day' radiative cooling. The optimized grating structure achieves the weighted emissivity of 0.985 in the atmospheric transparent window with the solar reflectivity of 0.933, leading to the predicted all-day average cooling power of 85 ~ 130 W/m(2). We also show from outdoor experiments that the proposed structure can produce 4.1 6.3 W/m(2) extra all-day cooling power compared to a flat PDMS emitter. Furthermore, the grating-patterned surface introduces self-cleaning feature that is desirable for long-term usage.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2022-09
Language
English
Article Type
Article
Citation

APPLIED THERMAL ENGINEERING, v.214

ISSN
1359-4311
DOI
10.1016/j.applthermaleng.2022.118771
URI
http://hdl.handle.net/10203/297481
Appears in Collection
ME-Journal Papers(저널논문)
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